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E5052B - baseband input - why I am getting -36dB power offset?

Question asked by mirek on Dec 19, 2016
Latest reply on Dec 24, 2016 by Hiroshi

I see a power offset on E5052B SSA baseband receiver. I am applying -40dBm 100 KHz in to baseband receiver and I am gettin -76dBm. The power offset on the screen is set to 0dB.

I can switch the internal gain between 0 to 30dB, but the amplitude is always the same.

My first assumption was the the receiver is damaged, however I have other SSA including  E5052A that have baseband receiver and I see same amplitude.  

From where the offset come? And why it is there?

My assumption is that the power detected on base band receiver should show real power.